We used to have wind, many moons ago. It might have been back in AH1.
The thing with wind was, it wasn't dynamic. It could be set by layer, and speed, and direction, but I don't think it ever changed. So, Country X would be zipping along with a nice tail wind, while Country Y had to fly into headwinds all night. It also made for some nice scenic routes when you'd forget about the 20mph crosswind, go AFK on auto and come back 20 miles off course.
I suppose if it were random and varied over time and across the map, it'd be more of an immersive feature, whereas it was mostly just a pita in AH1.